advair may increase your risk of osteoporosis and some eye problems. tell your doctor if you have a heart condition or high blood pressure before taking advair. if you're still having difficulty breathing, ask your doctor if including advair could help improve your lung function. get your first full prescription free and save on refills at advaircopd.com. >> pelley: today, federal >> pelley: today, federal investigators say they still don't know what caused batteries to burn in two boeing 787 dreamliners. and until they figure that out and how to fix the problem, none of the planes will be allowed to fly. we asked sharyl attkisson for the latest on the investigation. >> reporter: more than any other plane, the dreamliner relies on lithium ion batteries to help power its advanced systems. they're lighter and more powerful than older battery types. but they contain a highly flammable liquid electrolyte. federal investigators are examining the disassembled battery from the 787 that caught fire in boston january 7. george bromagain worked for eveready for